If the operation ^ is defined by the equation x ^ y = 2 x + y, what is the value of a in 2 ^ a = a ^ 3?
(A) -1
(B) 0
(C) 1
(D) 3
(E) 4
a in 2 ^ a = a ^ 3
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2^a = a^3
2*2 + a = 2*a + 3
[spoiler]a = 1[/spoiler]
2*2 + a = 2*a + 3
[spoiler]a = 1[/spoiler]
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